Lamp base



FIG. 1 is a perspective view of a lamp base comprising the new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a front view of a second embodiment of a lamp base comprising the new design, shown having indeterminate height;

FIG. 5 is a front view of a third embodiment of a lamp base comprising the new design, shown having an opaque surface;

FIG. 6 .is a perspective view of a fourth embodiment of a lamp base comprising the new design;

FIG. 7 is a top plan view thereof;

FIG. 8 is a front view thereof;

FIG. 9 is a front view of a fifth embodiment of a lamp base comprising the new design, shown having indeterminate height; and,

FIG. 10 is a front view of a sixth embodiment of a lamp base comprising the new design, shown having an opaque surface.

The broken lines in the figures are for illustrative purposes only and form no part of the claimed invention. 

The ornamental design for a lamp base, as shown and described. 